Potential of Transforming Sodalite from Synthesis Kaolin with a Mild Condition of the Hydrothermal Method

The hydrothermal synthesis method is one of the successful methods for transforming kaolin into sodalite with various parameters considered. The variation of alkalinity source of 2-3 Molarity of sodium hydroxide and crystallization time (12-16 hours) was considered an important parameter that influences the formation of sodalite. It is reported in this research that the process of synthesizing sodalite to transform into an amorphous stage (Metakaolinization phase) began with beneficiation of kaolin to remove the impurities and calcination by 6500C for four hours. The synthesis was done through an aging process (400C, 24 hours), and the crystallization temperature was 1000C. The kaolin was characterized by XRD, FESEM, FTIR, PSA, TGA, followed with metakaolin by XRD, FESEM, FTIR, and the end-product by XRD, FESEM, FTIR, and PSA. The crystallinity percentage of sodalite slightly increased by increasing the molarity and crystallization time, but quartz remains in the end-product.

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Microwave-Assisted vs. Conventional Hydrothermal Synthesis of MoS2 Nanosheets: Application towards Hydrogen Evolution Reaction

Crystals ◽

10.3390/cryst10111040 ◽

2020 ◽

Vol 10 (11) ◽

pp. 1040 ◽

Cited By ~ 1

Author(s):

Getachew Solomon ◽

Raffaello Mazzaro ◽

Vittorio Morandi ◽

Isabella Concina ◽

Alberto Vomiero

Keyword(s):

Hydrothermal Synthesis ◽

Hydrothermal Method ◽

Hydrogen Evolution ◽

Hydrogen Evolution Reaction ◽

Current Density ◽

Crystal Morphology ◽

Synthesis Method ◽

Synthesis Methods ◽

Mos2 Nanosheets ◽

Microwave Assisted

Molybdenum sulfide (MoS2) has emerged as a promising catalyst for hydrogen evolution applications. The synthesis method mainly employed is a conventional hydrothermal method. This method requires a longer time compared to other methods such as microwave synthesis methods. There is a lack of comparison of the two synthesis methods in terms of crystal morphology and its electrochemical activities. In this work, MoS2 nanosheets are synthesized using both hydrothermal (HT-MoS2) and advanced microwave methods (MW-MoS2), their crystal morphology, and catalytical efficiency towards hydrogen evolution reaction (HER) were compared. MoS2 nanosheet is obtained using microwave-assisted synthesis in a very short time (30 min) compared to the 24 h hydrothermal synthesis method. Both methods produce thin and aggregated nanosheets. However, the nanosheets synthesized by the microwave method have a less crumpled structure and smoother edges compared to the hydrothermal method. The as-prepared nanosheets are tested and used as a catalyst for hydrogen evolution results in nearly similar electrocatalytic performance. Experimental results showed that: HT-MoS2 displays a current density of 10 mA/cm2 at overpotential (−280 mV) compared to MW-MoS2 which requires −320 mV to produce a similar current density, suggesting that the HT-MoS2 more active towards hydrogen evolutions reaction.

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Significantly enhanced thermoelectric performance of Cu-doped p-type Bi0.5Sb1.5Te3 by a hydrothermal synthesis method

RSC Advances ◽

10.1039/c7ra06277j ◽

2017 ◽

Vol 7 (65) ◽

pp. 41111-41116 ◽

Cited By ~ 6

Author(s):

Zichen Wei ◽

Chenyang Wang ◽

Li You ◽

Shijie Zhao ◽

Kang Yang ◽

...

Keyword(s):

Thermal Conductivity ◽

Electrical Conductivity ◽

Hydrothermal Synthesis ◽

Hydrothermal Method ◽

Synthesis Method ◽

Thermoelectric Performance ◽

P Type

Increased electrical conductivity and decreased thermal conductivity were achieved simultaneously in the Cu-doped Bi0.5Sb1.5Te3 synthesized by a hydrothermal method.

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Two-Step Hydrothermal Synthesis of Well-Dispersed (Na0.5Bi0.5)TiO3 Spherical Powders

Journal of Nanomaterials ◽

10.1155/2019/4768069 ◽

2019 ◽

Vol 2019 ◽

pp. 1-8 ◽

Cited By ~ 1

Author(s):

Zhuo Shi ◽

Lianlai Sun ◽

Kun Liu ◽

Yingying Zhang ◽

Weiyuan Wang ◽

...

Keyword(s):

Particle Size ◽

Hydrothermal Synthesis ◽

Hydrothermal Method ◽

Synthesis Method ◽

Spherical Shape ◽

Raw Material ◽

Second Step ◽

In Situ Crystallization ◽

Uniform Particle Size

(Na0.5Bi0.5)TiO3 (NBT) powders that have well-dispersed, uniform particle size and well-developed spherical shape were successfully prepared by a two-step hydrothermal synthesis method. Nanosized TiO2 powders were firstly synthesized by a hydrothermal method, and then the TiO2 particles are used as a raw material to synthesize NBT powders. It was found that by using the TiO2 nanoparticles as Ti source, the well-dispersed spherical NBT powders with about 200 nm in size could be obtained at 200°C for 4 h with a low mineralizer concentration of 6 mol/L NaOH in the second step. The formation of spherical NBT powders can be explained by first generating nuclei on the surface of TiO2 nanoparticles via in situ crystallization mechanism and then crystal growing and agglomerating by dissolution-recrystallization mechanism.

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Synthesis of MnNi–SAPO-34 by a one-pot hydrothermal method and its excellent performance for the selective catalytic reduction of NO by NH3

Catalysis Science & Technology ◽

10.1039/c7cy01507k ◽

2017 ◽

Vol 7 (21) ◽

pp. 4984-4995 ◽

Cited By ~ 15

Author(s):

Rui Li ◽

Zhibin Li ◽

Liqiang Chen ◽

Yongli Dong ◽

Shibo Ma ◽

...

Keyword(s):

Hydrothermal Synthesis ◽

Selective Catalytic Reduction ◽

Hydrothermal Method ◽

Strong Interaction ◽

Catalytic Reduction ◽

Synthesis Method ◽

Excellent Performance ◽

One Pot ◽

Reduction Of No ◽

Ni Species

MnNi–SAPO-34 with Mn and Ni incorporated in the framework of SAPO-34 prepared by a one-pot hydrothermal synthesis method exhibits excellent NH3-SCR activity, which is attributed to the strong interaction between the Mn and Ni species.

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Hydrothermal Synthesis and Characterization of (Na0.8K0.2)0.5Bi0.5TiO3 Perovskite-Type Oxides with Cubic Morghology

Materials Science Forum ◽

10.4028/www.scientific.net/msf.687.283 ◽

2011 ◽

Vol 687 ◽

pp. 283-286

Author(s):

Yan Wang ◽

Jian Ping Long ◽

Miao Deng ◽

Jun Feng Li ◽

Qin Kong

Keyword(s):

Solid Solution ◽

Hydrothermal Synthesis ◽

Size Distribution ◽

Hydrothermal Method ◽

Mild Condition ◽

Perovskite Phase ◽

Synthesis And Characterization ◽

Particles Size Distribution ◽

Perovskite Type

The (Na0.8K0.2)0.5Bi0.5TiO3 perovskite-type solid solution was prepared under mild condition at 160°C using Ti(OC4H9)4, Bi(NO3)3•5H2O as Bi and Ti sources by a mechanical hydrothermal method. It is suggested that mineralizer plays an important role in facilitating the crystallization of obtained products and promoting the formation of perovskite phase. The crystallized products were characterized by means of XRD, SEM and DSC-TG. The results show that the well-developed crystallite with a pure pervoskite structure has been formed. The powders with regular cubic morphology exhibit low agglomeration and narrow particles size distribution in the range of 3~6μm.

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Facile Synthesis of One-Dimensional Titania Nanotubes via Hydrothermal Method

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1087.182 ◽

2015 ◽

Vol 1087 ◽

pp. 182-185

Author(s):

Chin Wei Lai ◽

Joon Ching Juan

Keyword(s):

Aqueous Solution ◽

Titanium Dioxide ◽

Hydrothermal Synthesis ◽

Hydrothermal Method ◽

Synthesis Method ◽

High Conversion ◽

Outer Diameter ◽

Facile Synthesis ◽

One Dimensional ◽

Synthesis Stage

Titanium dioxide (TiO2) nanoarchitecture has been widely used in the environmental and energy related applications. Herein, a simple and facile synthesis method will be introduced for high-conversion preparation of TiO2 nanotubes using hydrothermal method from nanoscale TiO2 particles. The quantity of TiO2 nanoparticles being used towards the formation of nanotubes was investigated using FESEM, TEM and EDX. In the present study, TiO2 nanoparticles were treated chemically with NaOH aqueous solution and subsequently with HCl aqueous solution under optimum experimental condition. It was found that the TiO2 nanotubes with outer diameter of 10 nm were successfully formed. In this case, the amount of residual Na+ ions during the hydrothermal synthesis stage can be controlled by HCl treatment, which resulted in the formation of one-dimensional TiO2 nanotubes.

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P-type conducting transparent characteristics of delafossite Ca doped CuScO2 prepared by hydrothermal synthesis

Dalton Transactions ◽

10.1039/d1dt00362c ◽

2021 ◽

Author(s):

Han Gao ◽

Xianwei Zeng ◽

Qiang Guo ◽

Zhi Yang ◽

Yanwen Deng ◽

...

Keyword(s):

Hydrothermal Synthesis ◽

Hydrothermal Method ◽

Delafossite Oxides ◽

P Type

Ca doped CuScO2 (CSO) delafossite oxides with 3-4 μm were synthesized through hydrothermal method using Cu(NO3)2•3H2O, Sc(NO3)3•xH2O as precursor at 240 °C for 24 h in this work. The influence...

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Sol-Gel Synthesis of the Double Perovskite Sr2FeMoO6 by Microwave Technique

Materials ◽

10.3390/ma14143876 ◽

2021 ◽

Vol 14 (14) ◽

pp. 3876

Author(s):

Jesús Valdés ◽

Daniel Reséndiz ◽

Ángeles Cuán ◽

Rufino Nava ◽

Bertha Aguilar ◽

...

Keyword(s):

Particle Size ◽

Hydrothermal Synthesis ◽

Microwave Radiation ◽

Structural Characteristics ◽

Sol Gel ◽

Synthesis Method ◽

Double Perovskite ◽

Synthesis Methods ◽

X Ray ◽

Sol Gel Synthesis

The effect of microwave radiation on the hydrothermal synthesis of the double perovskite Sr2FeMoO6 has been studied based on a comparison of the particle size and structural characteristics of products from both methods. A temperature, pressure, and pH condition screening was performed, and the most representative results of these are herein presented and discussed. Radiation of microwaves in the hydrothermal synthesis method led to a decrease in crystallite size, which is an effect from the reaction temperature. The particle size ranged from 378 to 318 nm when pH was 4.5 and pressure was kept under 40 bars. According to X-ray diffraction (XRD) results coupled with the size-strain plot method, the product obtained by both synthesis methods (with and without microwave radiation) have similar crystal purity. The Scanning Electron Microscopy (SEM) and Energy Dispersive X-ray Spectroscopy (EDS) techniques showed that the morphology and the distribution of metal ions are uniform. The Curie temperature obtained by thermogravimetric analysis indicates that, in the presence of microwaves, the value was higher with respect to traditional synthesis from 335 K to 342.5 K. Consequently, microwave radiation enhances the diffusion and nucleation process of ionic precursors during the synthesis, which promotes a uniform heating in the reaction mixture leading to a reduction in the particle size, but keeping good crystallinity of the double perovskite. Precursor phases and the final purity of the Sr2FeMoO6 powder can be controlled via hydrothermal microwave heating on the first stages of the Sol-Gel method.

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